OK, I bench tested the compressor and found this:
Air comes out of the fitting in the first pic.
NOTHING comes out of the fitting for the air line that goes to the airbags.
With the hoses replaced, the fittings in the pics 1,2, and 4 are all connected, and the canister in #4 is open to the air.
Something isn't right. If the desiccant tank is plugged, would this cause the outcome?
I need help here, I need this car to work an pull a trailer tomorrow morning......